johnson



(No Model.)

T. L. JOHNSON.

GAR BRAKE.

No. 263,529. Patented Aug. 29, 1882.

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IINTTBD STATES PATENT Trice.

TOM L. JOHNSON, OF INDIANAPOLIS, INDIANA.

CAR-'BRAKE SPECIFICATION forming part of Letters Patent No. 263,529, dated August 29, 1,882.

Application tiled June 17, 1882. (No model.)

To all whom it may concern:

Beit known that l, TOM L. JOHNSON, of the city of Indianapolis, county of Marion, and State of Indiana, have invented certain new and useful Improvements in Brake Mechanism for Cars, of which the following is aspecification.

The principal object of my said invention is to produce a brake mechanism ot' that variety in which the impetus of the car is utilized to wind the brakes, by means of which the brakes on several cars may be set by the force derived from a single car. A further object is to improve the construction of the said variety of brakev mechanism, and to render it more efiicient, whether applied to one or more cars.

The several features of the said invention will rst be fully described in connection with the cars to which it is applied, and then pointed out in the claims.

Referring to the accompanying drawings, which are made a part hereof, and on which similar letters of reference indicate similar parts, Figure 1 is a plan view of the framework and running-gear of two cars coupled togetherand having myimproved brake mechanism applied thereto, Fig. 2, a longitudinal vertical section of the one having the operating mechanism thereon on the dotted line z z and on an enlarged scale; Fig. 3, atransverse vertical section ofthe same on the dotted line y y; Fig. 4, a longitudinal section of the same on the dotted line x a0 on a still further enlarged scale; Fig. 5, a plan similar to a portion of Fig. l, but on tne same scale as Fig. 4; and Fig. 6, a detail section on the dotted line w w.

In said drawings, the portions marked A represent the frame-work of the cars; B, the

wheels; O, the axles; D, the spools thereon; E, a clutch part for putting said spool in motion; F G, the portions of a screw-cam which serve to operate said clutch part; H, a fixed collar ou the axle to hold said cam portions in place; I, a lever for operating the screw-cam; J, a chain connecting the spools and reciprocating bars, and K said bars.

The frame-work A, wheels B, axles C, and couplings A2 are or may be of any usual or approved construction, and need vno special description.

The spool D is mounted loosely on the axle,

and does not revolve therewith, except when the clutch is operated to secure it. It is prevented from an endwise movement along the Vaxle by having its end abut against the hub of the wheel or against a fixed collar on the axle.

The clutch partE corresponds in its general appearance to the end ot' the spool D, which also forms the other clutch part. I t is mounted upon the axle alongside said spool, and is prevented from turning on the axle by the spline c, which, however, permits a free movement longitudinally of the axle.

The'portionsF G of the screw-cam are loosely mounted on the axle between the clutch part E and the fixed collar H. Both are screwthreadedone externally' and the other internally-and the one enters the other, as shown, so that a rotation of either will expand or contract the whole device, and thus either force the clutch part E against the clutch end of the spool D or withdraw it therefrom. The part F is secured from rotation by the stay-rod F', which is secured at one end to the frame-work A and at the other end to the iiange f upon said part. The attachment of said stay-rod to said tlange should be adjustable, in order that.

the screw, when turned in the proper direction, shall operate to force the clutch part E to exactly the position required to firmly lock the spool D. This adjustment may be effected in various ways, as by a turn-buckle in the stayrod, or several holes in the liange, through which the bolt connecting said rod to said flange may be alternately inserted, as shown at the left in Fig. 2, or by two nuts, one upon each side ofthe timber, through which 4said rod' passes, or a ratchet-and-pawl arrangement, as shown at the right in said Fig. 2 and in Figs. 4, 5` and 6. The latter is the preferable way, and the one which I especially claim as my invention, and will therefore be more fully described.

The ange f has two side flanges provided with cogs upon their inside faces, and the housingj" upon the end of the rod F', which lits over them, has corresponding cogs, which engage therewith when said housing is raised up. A cam, f2, which is mounted in said housing, operates to hold said housing up, so

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that the cogs thereon shall engage with the cogs on the ange when it is in the position shown most plainly in Fig. 6, but when it is turned partly around, so that the short side thereof is down, will permit said cogs to become disengaged and the ange to pass freely back and forth through the housing, and that without removing any bolts or turning any nuts. Said housing is preferably constructed in piece with the rod F', as shown.

A small flange or collar, f3, engages with a groove in the clutch part E, and said part F is thus enabled to withdraw said part E from contact with the spool D, as well as to force it into contact therewith.

Each part G is connected to the lever I by means of a rod or bar, G', which is attached to said lever at one end and to the arm g on said part at the other. As will be readily seen, especially from Fig. 2, a movement of said leve will partially rotate both said parts G, thus expanding or contracting the device F G, as a whole, and either forcing the clutch parts into engagement or drawing them apart. Said part G is att-ached to the tixed collar H by means ot' a flange or collar, y', which enters a groove in said xed coilar.

By means ofthe several attachments shown it will readily be seen that when the deviceF Gr is shortened it not only relieves the pressure of the clutch part F on the spool I), but withdraws it entirely from contact therewith.

The lever I extends up through the bottom of the car to where it can be easily reached by the operator. Both the iods G' are fastened thereto near its bottom, one on one side ot' its pivott' and the other on the other, so that a movement thereof shall operate both siniultaneously.

The chains J are connected to the spool D at one end and to the bars K at thc other, said bars being attached firmly to the framework ot' the car by means ot the bolts k. When the clutches are operated and the spools l) are thereby caused to become rigid with the axles the slack in said chains is wound thereon, and then said axles and wheels are held from turning, and the car is thus effectually stopped.

The bars K are, together with the cross- `bars K' sim r)lv means b i which all the lower ot' the apparatus on both axles can be rendered equally effective when applied to that car only upon which the appara-tus is located. \Vhen applied to a train of cars it serves, by means of the rod K2, to communicate power to the brake 'mechanism ot' the other cars. It' there is but a single other car in the train, said rod runs directly to its brake mechanism; but it' there are two or more other cars an equalizer, k2, is employed, from one end of which runs a rod, K3, to the brake mechanism of the car next it, and from the other end ot' which runs a rod, K4, to the mechanism of the car beyond, or, it' there are more ears in the train, to a second equalizer. The rods K3 K4 can be moved from the two ends to the center of the equalizer when rendered advisable by the absence of a third car.

My said invention is especially intended for use ou the cars of those street-railroads which are run by cables from a stationary power, such cars needinga more powerful brakethan that usually found on street-cars, for the reason that a more sudden stopping of such cars is often necessary, to avert accidents and for other reasons, than can be effected by ordinary brakes.

I do not desire to be understood as contining myself to mechanism wherein apparatus shall be mounted upon both axles, but may employ the same upon one axle only when the power from both is not required.

IIaving thus fully described my said invention, what I claim as new, and desire to secure by Letters Patent, is-

1. 'Ihe combination, with the clutch and winding-spool ot' a brake, of a mechanism for operating the clutch, consisting ot' two screw parts, one ot' which enters thel other, one ot' which is attached to the clutch part by means ot' a collar or fork, f3, which is fastened to said screw part and enters a groove in said clutch part, and the other ot" which is attached to a fixed collar on said shaft by a collar or fork, g', which is attached to said screw part and enters a groove in said tixed collar, substantially as described, and for the purposes specified.

2. rBhe combination, with the cams for operating the clutch parts E E, one of which is upon each ofthe two axles of acar, of the operating-bar I, pivoted at t' and connected to said cams by the rods G' G', attached to said bar, one above and the ether below said pivotpoint, substantially as shown and described.

3. The combination, with the cam parts for operating the clutch ot' a brake, ofthe adjusting apparatus consisting ofthe rod F', the flange j', provided with cogs, the housingf', also provided with cogs, and the eccentricfz for operating said housing, so that the eogs on said parts f' and j" may be engaged with or disengaged from each other, substantially as Set forth.

4. The combination of the spool and clutch parts, they lever for operating' the same, the bars K K, the cross-bars K' K', pivoted to the frame-work ot' the car, the chains connecting the bars K to the spools, the rod K2, the equalizer k2, the rods K3 K, and the brake mechanism ot' the other cars otI the train, substantially as set forth.

5. In a car-brake mechanism, the combination of the axles, spools thereon, windingchains on said spools and attached toaframework, and said frame-work consisting of two side bars and two cross-bars, theA latter of which are pivoted to the frame-work of the car, as at lr, substantially as set forth.

In witness whereof I have hereunto set my hand and seal, at Indianapolis, Indiana, this 12th day of June, A. D. 1852.

'IOM Il. JOHNSON.

In presence ot'- C. BRADFORD, E. W. BRADFORD.

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